Join Date: Jun 2010
Location: Work in Asia, now based in Vienna, VA
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Hi. I'm no expert on Follis, but many French bikes used Sugino BB & cranks in the mid-70s, when the bike boom demand outstripped supply of Stronglight - the usual choice for French bikes. So, it is not impossible that this is original. You need to measure the axle length to see if it is a standard double, probably 114mm. If so, pretty much any of the vintage Stronglight, Campy, Sugino cranksets would fit.
That said, you should probably open it up to clean and regrease, anyway. This will give you a chance to measure more carefully, and to read what is on the spindle, itself. The photo barely shows, but it does seem to be French threaded. This limits options, but not impossibly. There's Velo Orane, Phil, or simply clean/repack and use this one. If it ain't pitted, it's probably just fine.
I defer to greater expertise here, tho.